X - -robert



lan. 2, 1923. v1,440,909

R. 0. COLE.

RENEwABLE INcLosED ELEcTRlc Fuss. FILED APR. 27. |921.

ATTORNEY l/loaZZwwm it may cof/wem: y y i Be it` known that I7 ROBERTv C.` COLE, a

Patented, Jan. 2, 1923.

ROBERTO. conn, `or 'RTFORD; coNNnoTcT," AssIGNoRl-ro :on

or HARTFORD, conivnc'rcuzr, A coRroRA'rmN or Coiv'ivnc'irrofr.`

RENEWABLE rNcLosnn ELECTRIC `rusia.`

Application filed p1-i1 27, 1921. serial no. 484,815.-l

" citizen of the United- States, residing at Hartford, in the county of Hartford and" State of Connecticut,` have invented a new and useful Improvement in Renewable Inclosed Electric Fuses, of which fthe following is a` specification. i

This invention relates to the construction of the ferrule contact type of the renewable Yclass of'in'closed electric fuses and more particularly to such fuses as are 'designed'to l permit the pressure ofthe gas generated a simple and cheap construotion'iby means of which the `parts can `without shutting oft'` the gas escape, be readily assembled 4and the p fferrules securely locked on" the casing yon links to' escape by passingaround the threads ferrules` p The object of this invention is toprovide threads on the casing and the threads in the fwhich they are screwed so that theywill `not'become loosened and turned should the casing shrink or asV the end caps `are unscrewed and replaced when a new fusible link is substituted -for one that hasA been blown. Y y ,l

This object isv attainedfby securing `the ferrules on the 'ends of the insulating casing y with spring ringsarranged between them in such manner that `the ferrules can be` freely screwed on but'when once in place y Y having their opposite ends engaging therewith ywhereby the `ferrules may belreely'V `f screwed upon the casing but not unscrewedycannot be'unscrewed, the spring rings locking the ferrulesin place so thatthe endcaps may be screwed on andfunscrewed without turning the ferrules which are yloosely screwed, on the casing. i

In the' accompanying drawings `Fig 1 `shows a side view yof a fuse which embodies Fig. 2 shows the central the invention. longitudinal section of the fuse. Fig. 3 shows a side view of one end of the insulating tubular casing. Fig. shows an end view of the casing. Fig. 5 is a view looking into` one of the ferrules. Fig/6 is a side view of one ofthe locking rings. Fig. 7v is a plan of the locking ring.

The casing l of` this fuse is a sectionof" *finsulating material, usually? ber, withvex-I Y terior threads formed on its ends. ,Screwed somewhat loosely onthe ends ofl the casing are ferrules'commonly made of brass.' In the ends of the casing are notcheswhich `permit the vescape of gas pressure` fromfthe interior of the casing to the threads `whichr secure the ferrulesto thevcasing.-U Extending in from the notches are `slots "lfdesignedgto receive the turneddown ends-5 of the sp`ri'ng.` y lockinglrings6 whichare arranged between* the'ends of the casing andshoulder'f?" in the ferrulesi' The faces 'of .these shoulders 'in vthe lferrules are desirably pressed sogas to forniv ratchet teeth" 8 that are engagedbythe ends 9 of thespringrings. Slotted washers 70y i andthe ends 11 'of-'the fusible linklQ are 10 are set intoA the outer ends of lthe ferrules thrust throughfthe slots and bent/ over on the outside of the washers, after which the end caps 13 `are screwedupon the ferrul'es so as to clamp the'ends of the link against p With this construction there is a metal to metal contact between the ends of thelink and the ferrules. The end caps can'be easily screwed on and off the ferrules and `yet the .ferrules while they can be readily screwed upon the ends of the casing with the'desired the end caps are unscrewed. The invention claimed is: p l I 1.- `An inclosed `fusecomprising an insulating casing,` ferrules screwed upon the casing,

looseness cannot be'turned backward"` when i annular spring ypawls between the ends of thecasing and the ferrules, said pawls being independent of the casing and ferrules but fromthe casing, metal washers located at the ends of the ferrules,.a fusible link with clamping the` ends of the link` to the t washers. y y r. v. y r 2. An inclosed `fusecomprisingan. insulating casing, a ferrulel screwed upon veachend of the casing, a spring lockingv ring arranged l between the'lcaslngand ferrule at 'eachend with one end ofthe ring engaging a notch in the `end of the casing andthe. other end of thering engaging atoothedshoulder'in the errule, metal Washers oceted in the 5 clamping the ends of the/link to the washers.

,'l-he` combinetonoe tubular insulating ege/10,909

end of the casing and an independent ooking Washer loca-Tied betweenthe end of alle casing and e. shoulder in the erule und hevng its endsengagng the respective parte to preventrelatve rot-ation of one to the other in one direction n y 'ROBERT C.' 'GQLEQ 

